[Bug 94471] New: Displayport monitor randomly disconnects

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=94471

            Bug ID: 94471
           Summary: Displayport monitor randomly disconnects
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.18.0-rc7.emp3
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: isaac@mm.st
        Regression: No

Created attachment 169651
  --> https://bugzilla.kernel.org/attachment.cgi?id=169651&action=edit
journalctl output showing disconnect and following reboot to recover

I have a display port monitor running at 2560x1440 60Hz that my laptop will
randomly disconnect from. When this occurs the following error shows up in the
system log:

[drm:drm_dp_get_mst_branch_device] *ERROR* failed to lookup MSTB with lct 2,
rad 00

The only recovery I have been able to manage on a consistent basis is to
restart the machine (and monitor it seems). Obviously not much of a workaround.

The last time this occurred I was able to fix this by disabling the display
with xrandr for awhile, then turning it back on. This last time this did not
work, and doing that a few times actually hard-locked the system.

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